Sounds like a good plan. My understanding is that gold is deposited from hydrothermal fluids emanating from magma chambers into neighbouring or overlying rocks. This process effectively depletes the granitic magma chamber of its gold.
if overlying rocks are eroded away their gold can then sit on top of the granite or perhaps be moved there by eons of weathering processes in adjoining (contacting) rocks.
In Victoria this has been known at Rheola where a rich field of nuggets was found in alluvium overlying a granite bedrock. Nothing was found in the granite underneath and it was assumed that the nuggets were derived from reefs in overlying Ordovician rocks long ago eroded away.
To the side of the granite surviving Ordovician rocks were found to contain rich nuggetty reefs and associated rich runs of diggings.